2 Jun
1998
2 Jun
'98
1:41 a.m.
Carl R. Friend wrote:
On Mon, 01 Jun 1998 14:49:39
rigdonj(a)intellistar.net remarked:
It's generally 400 (plus or minus 50) hz for aircraft and associated
equipment (missiles for instance). Our test equipment racks for Air Launched
Cruise Missiles had a HP 1000 computer tied to an IEEE 488 interface and all
of that ran from a motor-generator that took 3 phase 220 volt @ 60hz to
power an electric motor that turned a generator similar to an aircraft's
engine driven generator.
The biggest advantage of the higher cycle rate is smaller packages and
cooler running.
Locomotives and (as you stated) larger water craft also use 400hz equipment.
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Oddly enough a lot of the HP stuff is
spec'd to run on 50 to
440 Hz. I'm not sure why unless it's to allow it to also be used
in aircraft but that doesn't seem likely.
Shipboard applications are frequently run at 440 Hz as well as
aircraft; it's quite common in military environments as it keeps the
transformers small. Actually, I believe it's 400 Hz, not 440, but
whats a few ticks between friends?